What's happening to the memory on my MBA?

macrumors regular

I have found that I am often deleting video files on my Macbook Air (Late 2011 model), despite the fact I know that I don't add junk apps onto my Macbook.

I looked up my data storage stats on 'About my Mac' and found something was terribly wrong (see attached). The numbers don't add up. If we add up the numbers, I have only used 88gb of my hard drive, not 210gb as the picture says!

Also, I am colourblind but does the 'other' bar seem to be bigger than the others despite the fact it says 'Other: Zero KB'.

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